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A water table higher than the well ensures water pressure will consistently force water into the well.
A well drilled through impermeable strata to reach water capable of rising to the surface by internal hydrostatic pressure.
[French artésien, from Old French artesien, of Artois, from Arteis, Artois, France.]
artesian well(ɑːˈtiːzɪən; -ʒən)
(General Engineering) a well sunk through impermeable strata into strata receiving water from an area at a higher altitude than that of the well, so that there is sufficient pressure to force water to flow upwards
[C19: from French artésien, from Old French Arteis Artois, old province, where such wells were common]
ar•te′sian well′(ɑrˈti ʒən)
a well in which water rises under pressure from a permeable stratum overlaid by impermeable rock.
[< French artésien pertaining to Artois, where wells of this kind are found]
If the water table in the recharge area is higher than the surface of a well, then the water will flow from the well without being pumped.
A deep well that passes through hard, nonporous rock or sediment and reaches an aquifer in which the water is under enough pressure to rise to a height above the water table. ♦ In a flowing artesian well the water is under enough pressure to rise to the surface without being pumped.